Skip to content 
Water Heater Repair & Installation — Tank & Tankless
Delex Plumbing repairs and installs all types of water heaters in Mississauga — tank units, tankless systems, gas and electric — with same-day service, TSSA certification for gas work, and a written warranty on every installation.
Water Heater Repair — Same-Day No-Hot-Water Service
No hot water is one of the most disruptive failures — call our emergency plumbing line at 416-910-2550 any time. Delex Plumbing provides same-day water heater repair across Mississauga — our service vehicles carry heating elements, thermostats, anode rods, thermocouple and thermopile assemblies, gas valves, and TPR valves for same-visit repair in most cases.
Common water heater failures we repair: burned-out heating elements in electric tanks (a $250 to $400 repair), failed gas thermocouple or thermopile preventing pilot ignition (a $150 to $250 repair), failed pressure relief valve leaking from the discharge pipe (a $150 to $300 repair), and sediment-fouled tanks that have lost efficiency (a flush service that can restore normal function without replacement).
Tank Water Heater Installation — Rheem, Bradford White & AO Smith
Our water heater installation uses Rheem, Bradford White, and AO Smith tank units — the three brands with the strongest long-term reliability data in the Canadian market. Tank water heater installation includes the new unit, a new expansion tank (required by Ontario Building Code for closed plumbing systems), a new TPR valve and discharge pipe, new gas connector or electrical connections depending on the fuel type, and a drip pan with floor drain connection.
Most tank water heater installations are completed in 2 to 3 hours. We register every installation with the manufacturer on your behalf and provide you with the warranty documentation. The expansion tank and TPR valve that we include are not optional add-ons — they are code requirements, and any installation that omits them is not code-compliant.
Tankless Water Heater Installation — Navien & Rinnai
Tankless water heaters heat water on demand — no storage tank, no standby heat loss, unlimited hot water. Energy savings of 25 to 30 percent over a tank heater are typical for the average Canadian household. The reduced footprint is also significant for Port Credit condos and Mississauga townhouses with limited utility room space.
We install Navien NPE series and Rinnai RU series condensing tankless units — both featuring high efficiency ratings and Canadian cold-weather performance verified for Ontario’s climate. Tankless installation requires TSSA-certified gas work (we are certified), proper venting (typically 2-inch or 3-inch PVC through an exterior wall), and in some cases a gas line upgrade if the existing line is undersized for the unit’s BTU demand.
TSSA Certification — Gas Water Heater Compliance
Gas line and water heater work requires TSSA (Technical Standards and Safety Authority) certification in Ontario. This is not the same as a general plumbing licence — it is a separate, specific gas certification that authorizes the holder to connect, disconnect, and test natural gas and propane equipment. Delex Plumbing holds TSSA certification for all gas appliance work, including water heaters, boilers, and gas line installations.
Water Heater Maintenance — Annual Flush Service
Peel Region’s water supply is among the hardest in Ontario — averaging 18 to 20 grains per gallon of calcium hardness. This scale accumulates on the bottom of water heater tanks, reducing efficiency and accelerating element corrosion. Annual water heater flushing removes settled scale before it calcifies into a permanent insulating layer that shortens tank life by 3 to 5 years on average.
We recommend annual flushing for all tank water heaters in Mississauga homes, combined with anode rod inspection. Schedule a plumbing inspection to include water heater assessment alongside all other systems. These two maintenance tasks together can extend a water heater’s service life from the average 10 to 12 years toward the 15-plus-year mark.
Water Heater Service Area
Water Heater Venting — Category I, II, III & IV Systems
Water heater venting removes combustion products from gas-fired units. Standard atmospheric gas water heaters use Category I venting — a single-wall or B-vent metal flue that rises vertically to a roof penetration, relying on natural draft from the temperature differential between the hot flue gases and outdoor air. Category I venting is the most common residential configuration in Mississauga.
Direct-vent water heaters — increasingly common in new construction and replacements — use two coaxial pipes to draw combustion air from outside and exhaust products through the same penetration. This configuration is required when the water heater is installed in a confined space without adequate combustion air supply, or in tight-construction homes where natural draft is insufficient.
Venting condition is assessed during every water heater service call. Common venting problems: separated flue joints that allow carbon monoxide to enter the mechanical room, corroded flue sections in older single-wall vent configurations, and blocked terminations from bird nests or debris in horizontal vent terminations. These conditions create serious carbon monoxide risk and are addressed immediately when discovered.
Hot Water Recirculation Systems
Demand-controlled recirculation systems — an alternative to dedicated return lines — use the cold water line as the return path, activated by a button near the sink rather than on a timer. When the button is pressed, the pump moves the cold water at the fixture back toward the water heater until hot water reaches the sensor. This approach requires no additional return line but delivers less consistent performance than a dedicated loop.
Same-Day Service — Mississauga's Most Responsive Plumbing Team
Same-day plumbing service in Mississauga is available when you call before 10 a.m. on weekdays. We confirm a two-hour arrival window during your call and send a text notification when the plumber is 30 minutes away. If any scheduling change affects your window, our dispatcher calls you proactively — we do not leave clients waiting without information.
Our service vehicles are stocked with the 50 most commonly needed repair parts and materials. For the majority of Mississauga residential plumbing calls, this means the repair is completed on the first visit without a parts run to the supplier. On the rare occasion where a specialized part is required, we have established same-day supplier relationships and can typically complete the repair the same day in most cases.
Our service area covers every Mississauga postal code, from L4T in Malton to L5J in Clarkson, and from L5A in Cooksville to L5B in the Square One district. We do not charge additional fees for properties at the outer boundaries of our service area — Mississauga is our home territory and all points within it receive the same response standard.
Why Mississauga Homeowners Choose Delex Plumbing
Delex Plumbing has built its reputation across Mississauga through 10 years of consistent service — same-day response, flat-rate pricing with no surprise charges, and licensed master plumbers on every job. Our 384 verified five-star Google reviews reflect the cumulative experience of homeowners from Port Credit to Meadowvale who called us once for a routine repair and have called back for every plumbing need since.
The three things our clients most consistently cite in their reviews: we arrived when we said we would, the invoice matched the quote, and the plumber left the work area clean. These are not exceptional standards — they are baseline professional standards that should characterize every service business. We treat them as the floor rather than the ceiling of what our service delivers.
Our flat-rate pricing policy means the quote we provide before touching anything is the amount on your invoice when we leave. No overtime charges for after-hours calls. No travel fees for distances within our service area. No material markups disclosed after the job is done. Transparent pricing is how we have maintained a 5.0-star rating across 384 reviews — clients who receive exactly what they were quoted do not leave one-star reviews.
We back every job with a written labour warranty. If something we installed or repaired fails within the warranty period, we return and fix it at no charge. No runaround, no dispute about scope. The warranty documentation is included with the invoice and specifies the exact duration and scope of coverage. For fixture and material warranties from manufacturers, we register the installation and provide the registration confirmation so warranty claims go smoothly without paperwork obstacles.
Licensed & Insured — Water Heater by Certified Professionals
Every plumber on the Delex team holds a valid Certificate of Qualification from the Ontario College of Trades. This licence is not a formality — it is the legal prerequisite for performing plumbing work in Ontario, and it represents a minimum of 9,000 hours of apprenticeship training plus a journeyman examination that tests both technical knowledge and code compliance.
Full liability insurance protects your property if any accidental damage occurs during our work. Bonded coverage protects you from any dishonesty by our employees while on your property. WSIB coverage protects you from any liability if a worker is injured on your property. These are not optional additions to our service — they are standard protections that every legitimate plumbing company carries and that unlicensed operators routinely lack.
We pull permits for all work that requires them. Ontario Building Code requires permits for new plumbing installations, changes to drain and vent systems, and water heater replacements. A job done without a required permit leaves you without a legally completed installation — a disclosure obligation in real estate transactions and a potential coverage issue in insurance claims. Our permit fees are included in the project quote rather than added as a surprise at the end.
Frequently Asked Questions About Emergency Plumbing
Q: Should I repair or replace my water heater?
A: Under 8 years old and repair under $400: repair. Over 10 years old or repair over $500: replacement is usually more economical, especially if a switch to tankless can save 25 to 30 percent on energy costs annually. We give you honest options and let you decide.
Q: How much does water heater installation cost in Mississauga?
A: Tank water heater installation (supply and install including expansion tank) typically runs $1,500 to $2,800 depending on unit size and fuel type. Tankless installation runs $2,200 to $4,500. Call 416-910-2550 for a free on-site estimate.
Q: How long does water heater installation take?
A: Tank water heater replacement takes 2 to 3 hours. Tankless installation takes 3 to 5 hours. Both are completed in a single visit in most cases.
Get Your Free Estimate Today!
Or Give Us A Call: 416-910-2550
Licensed & Insured
Trusted Local Plumbers 
Fast Response
Usually Within 1 Hour 
Satisfaction Guaranteed
100% Quality Work Free Estimates — Call 416-910-2550
Every water heater job starts with a free estimate. Call 416-910-2550, contact us online, or request service for same-day no-hot-water response.
